Why is it printing this model solid

[abecker]

I have been a long time user of S3D but wanted to give KISS a try especially with the 1.6 release. However, when I go to print this model it is trying to make the infill solid once it gets about Z= 3, and I'm not sure why. It ends up putting down so much plastic that the outside has weird layer defects. I have attached the gcode and stl I am using. When I use S3D it prints it in a way that puts 1 line of infill in each layer.

Planter.zip

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[Tutorius]

The thing is that the wall is quite thin. I think that the slicer determines that a infill should be solid a this small walls.